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2 Sheets -Sheet 1.

E, BROWN.

Pyrometer.

Patented June 1.1869.

Fa'yZ- 5avezz Zvr N. PETERS. Mwlilhngnphun Wilhininn. D-C.

2 Sheets-Sheet 2. E. BROWN.

Patented June 1. 1869' 7ft 57066 a 612 31 X 56, WWW

N. PETERS PMlo-Lhfingnphur Wash mm o C.

Eduard fittin gaunt dtjjlinn.

Letters Patent No. 90,815, dated June 1, 1869.

IMPROVEMENT m PYROMETER.

The Schedule referred toin these Letters Patent andmaking part0! he lame.

To all whom it may concern Be it known that I, EDWARD BROWN, of 311 Walnut street, Philadelphia, Pennsylvania, have invented a new and improved Hot-Blast Pyrometer, or instrument for indicating high temperatures; and I do hereby declare the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the. letters of reference marked thereon.

My instrument is designed as a test-gauge, to be applied temporarily to the hot-blast ofa'smelting-filrnace. It is so arranged that the expansion-strips can at once he brought under the full temperature of the blast-,- and as easily detached from it, whilst at the same time the non-expansion bar is exterior to, and free from the influence ofth'e hotblast-. Several other minor points, which contribute to the accuracy, durability, and usefulness of the instrument, I will hereafter describe, among which is the jacketing of the open conducting-tube, the facility of removing the expansion-bar and replacing it, the arrangement of the expansion-bar upon a tension, whereby athin strip of metal can be used, which will acquire the heat almost instantly, the manner of communicating the motion to the dial, and the. way of securing the dial to the non-expanding bar.

Instruments hitherto used for this purpose, have only approximated to the temperature, and, in addition, are subject to constant deterioration.

To enable others skilled in the art to make and use my invention, 1 will proceed to describe its construction and operation.

Figure 1 is a side elevation of the instrument in its simplest form, the tube being in section.

Figure 2 is a cross-section through the tube.

Figure 3 is a section showing the details more completely.

Figure 4 is a front view of the instrument.

In fig. 1, A is a thin metal tube of iron, open at the top, and also at the bottom, for the full passage of the hot-blast, which rushes through at its full temperature and pressure, as soon as the instrumentis applied by hand to any orifice in the main blast-pipe, which mode of using the instrument gives the most accurate indication.

To the lower end of this tube A, isrigidly secured the non-expanding bar E, of wood, the least influenced of all materials by a moderate change of temperature. Its upper end carries the dial G.

The strips of metal D, are secured to the lower end of the tube, by pin (1'.

, Its upper end is jointed to the short arm of lever H, which lever is pivoted at h, upon the upper end of the bar E.

To the other end of the lever is attached the rod K,

which gives motion to the dial-hand M.

The rod K has upon it a screw working in two nuts, K K by which meansthe pointer M may be set at the normal temperature of the atmosphere, and adjusted, on replacing the expansion-strips, by a new of that shown in figs. 1 and 2, by which a greater amount of expansion may be obtained but I find one bar suflicient in practice. The dial G contains the usual movements of a steam-gauge, such as segment and pinion, to multiply motion.

This dial is secured rigidly to the bar E by a ball, S, through its upper flange, so that the expansion of the case' and the rod K neutralize each other, which I may explain more fully in this wa i The temperature close to the blast-pipe where the indication is taken, is often about 150 or 200. Now if the dial was secured by its lower flange rigidly to the bar It, this heat would expand the dial-case, and move the hand perhaps 50; the expansion of the rod Kfwould also add another 50 to the amount, thus making an error of 100 from the correct temperature. By securing the dial-case as shown, the expansion of the case is neutralized by the elongation of the rod K. Thus I have the dial-hand influenced only by the expansion-strip D. By this arrangement of the instrument, I can bring the full temperature of the blast upon a thin expansiomstrip, and obtain the indication in a fewseconds, and before the non-expanding bar and dial can be influenced by its close proximity to the blast-pipe.

Having'thus described my invention,

What I claim as new, and desire to secure by Letters'Patent, is-

The detachable hand-pyrometer, constructed with the tube A, open at each end for the free passage of the hot-blast, in combination with the usual expansionstrip D, arranged therein, for giving motion to the pointer of a dial, secured upon the non-expanding bar E, substantially as described. p

' EDWD. BROWN.

Witnesses:

J. THOMPSON GILL, W. Lnronsrnn Ans'rm. 

